金属氧化物改性的氧化锰八面体分子筛整体式催化剂催化分解臭氧性能  

Study on catalytic decomposition of ozone over metal oxide-modified OMS-2 monolithic catalysts

作　　者：陈崇来 张文霞 余会发 贾爱平 罗孟飞[2] CHEN Chonglai;ZHANG Wenxia;YU Huifa;JIA Aiping;LUO Mengfei(College of Pharmaceutics and Materials Engineering,Jinhua Polytechnic,Jinhua Zhejiang 321017;College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua Zhejiang 321004)

机构地区：[1]金华职业技术学院制药与材料工程学院,浙江金华321017 [2]浙江师范大学化学与生命科学学院,浙江金华321004

出　　处：《环境污染与防治》2020年第2期164-169,共6页Environmental Pollution & Control

基　　金：浙江省自然科学基金资助项目(No.LQ17B030001)

摘　　要：采用金属氧化物改性的氧化锰八面体分子筛(OMS-2)为原料,与铝胶混合涂覆到堇青石蜂窝陶瓷载体表面,制备得到金属氧化物改性的OMS-2整体式催化剂,并考察了不同金属氧化物改性对OMS-2催化剂在常温常压下分解臭氧性能的影响。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、拉曼光谱、X射线光电子能谱(XPS)、BET比表面积测试和程序升温氢气还原(H2-TPR)等多种技术对催化剂的物相结构、形貌、表面性质和还原性能等进行了表征。结果表明,CuO改性的OMS-2催化剂比未改性的OMS-2催化剂表现出更好的臭氧分解活性,而其他金属氧化物(Fe2O3、Co3O4、NiO和CeO2)改性的OMS-2催化剂活性相比之下均有一定程度降低。金属氧化物改性未对OMS-2催化剂的物相结构和形貌产生明显影响。然而,CuO改性的OMS-2催化剂具有最丰富的表面Mn3+含量和最佳的还原能力,这可能是OMS-2催化剂经CuO改性催化分解臭氧活性提高的主要原因。A series of manganese oxide octahedral molecular sieve(OMS-2)modified by metal oxides were mixed with aluminum gel and coated to cordierite honeycomb ceramic carrier to produce monolithic catalysts.The effect of metal oxide modification on catalytic decomposition of ozone over these OMS-2 based catalysts at ambient temperature and pressure conditions were investigated.The phase structure,morphology,surface properties and reducibility of these catalysts were characterized by X-ray powder diffraction(XRD),scanning electron microscope(SEM),Raman spectroscopy,X-ray photoelectron spectrometer(XPS),BET and hydrogen temperature-programmed reduction(H2-TPR).Based on the performance evaluation and reaction rates of catalytic decomposition of ozone over these catalysts,it was found that the CuO modified OMS-2 catalyst showed better activity than the unmodified OMS-2 catalyst,while the activity of other metal oxides(Fe2O3,Co3O4,NiO and CeO2)modified OMS-2 catalyst declined to a certain extent.Modification by different metal oxides had no significant effect on the phase structure and morphology of OMS-2 catalyst.However,the CuO modified OMS-2 catalyst had the most abundant surface Mn3+content and the best reduction ability,which might be the main reasons for the improvement of the catalytic decomposition of ozone activity over CuO modified OMS-2 catalyst.

关 键 词：臭氧 氧化锰八面体分子筛 金属氧化物改性 堇青石蜂窝陶瓷 整体式催化剂 

分 类 号：O643.36[理学—物理化学] X515[理学—化学]